Thanks so much guys It's sad how much I don't know about the techincality of ceramics but the white one was done with a clear glaze and the rest were just run of the mill glazes I believe. Not sure what kind of clay, halfway through the year my teacher changed it on my to something with more grog in it, which is way easier to use.

Ah it was a headache, but well worth it. I started with a round base then I rolled some balls I connected them leaving space in between, then I rolled a coil and attached it so like it made little "valleys" where there were no balls. Then I did the same thing but put balls in the "valleys". Hah I hope that makes sense.